You probably can’t unless you’re willing to spend $100 each for them on Amazon. I have three volumes (I wasn’t aware there were 4) and many of his stories are posted at https://historicipswich.net/2014/11/28/tales-of-olde-ipswich-by-harold-bowen/. These are articles he wrote for the newspaper “Ipswich Today.”
Historic Ipswich 
How do I acquire all 4 books written by harold b
You probably can’t unless you’re willing to spend $100 each for them on Amazon. I have three volumes (I wasn’t aware there were 4) and many of his stories are posted at https://historicipswich.net/2014/11/28/tales-of-olde-ipswich-by-harold-bowen/. These are articles he wrote for the newspaper “Ipswich Today.”